Networking
DNS, email authentication, and network configuration guidance.
Category Overview
Knowledge Clusters
Additional networking topics are actively being built out.
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Latest in Networking
SPF Configuration and Troubleshooting
Mechanisms, includes, redirects, the all qualifier, multiple-SPF-record conflicts, and the 10-lookup DNS limit that silently breaks otherwise-correct records.
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Email Authentication Architecture: How SPF, DKIM, and DMARC Work Together
Why SPF and DKIM alone do not protect a domain, what "alignment" actually means, and the decision flow a receiving mail server follows.
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DNS Troubleshooting and Security Signals: MX, NS, DNSSEC, and CAA
Common MX/NS/SOA misconfigurations, what DNSSEC and CAA records actually do, and the real difference between detecting a signal and cryptographically validating it.
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DNS Fundamentals for Business IT
Authoritative vs. recursive DNS, record types, delegation, and TTL — the operational concepts that matter when something breaks, not just how DNS works in theory.
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DMARC Policy and Reporting
Policy enforcement levels, alignment modes, aggregate and forensic reporting, and the safe monitor-to-enforcement progression.
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DKIM Configuration and Troubleshooting
Selectors, key rotation, DNS publication vs. signing, and why "selector not found" does not automatically mean DKIM is unconfigured.
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Operational Support
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